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Aiming to find new extremely metal-deficient star-forming galaxies weextracted from the Two-Degree Field Galaxy Redshift Survey (2dFGRS) 100K DataRelease 14 emission-line galaxies with relatively strong [OIII] 4363 emission.Spectroscopic and photometric studies of this sample and, in addition, of 7Tololo and 2 UM galaxies were performed on the basis of observations with theESO 3.6m telescope. All sample galaxies qualify with respect to theirphotometric and spectroscopic properties as blue compact dwarf (BCD) galaxies.Additionally, they show a good overlap with a comparison sample of 100well-studied emission-line galaxies on the 12+log(O/H) vs. log(Ne/O), log(Ar/O)and log(Fe/O) planes. From the analysis of the 2dFGRS subsample we report thediscovery of two new extremely metal-deficient BCDs with an oxygen abundance12+log(O/H) < 7.6 and of another seven galaxies with 12+log(O/H) < 7.8.Furthermore, we confirm previous oxygen abundance determinations for the BCDsTol 1304-353, Tol 2146-391, UM 559 and UM 570 to be 12+log(O/H) < 7.8.

New southern blue compact dwarf galaxies in the 2dF Galaxy redshift survey